They have a huge spike. If they come from mexico, they will say sostenon on them. They are pretty expensive, but fairly convenient. I would use the big spike to shoot into a different syringe.
Tried the 18 guage one time. Thought I would pass out. Hurt like a bastard. Going rate is about 12 bucks per shot. Too damn expensive in my opinion. Look around, and you can get same mix in other products much cheaper.
I like it a lot, just not worth the money.
B.